Contact app problem

I have an ipad 2 with software updated and am having a problem adding contacts to the contacts app. I don't have the + button at the bottom of the screen so I can't add any contacts. I have rebooted and also took it back to factory settings and added the bookmarks etc afterward but still have the same problem? I haven't added any apps since I got it about 4 months ago. Any help would sure be appreciated.